/***
*bios.h - declarations for bios interface functions and supporting definitions
*
*	Copyright (c) 1987-1990, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*	This file declares the constants, structures, and functions
*	used for accessing and using various BIOS interfaces.
*
****/

#ifndef _MT

/* manifest constants for BIOS serial communications (RS-232) support */

/* serial port services */

#define _COM_INIT	0	/* init serial port */
#define _COM_SEND	1	/* send character */
#define _COM_RECEIVE	2	/* receive character */
#define _COM_STATUS	3	/* get serial port status */

/* serial port initializers.  One and only one constant from each of the
 * following four groups - character size, stop bit, parity, and baud rate -
 * must be specified in the initialization byte.
 */

/* character size initializers */

#define _COM_CHR7	2	/* 7 bits characters */
#define _COM_CHR8	3	/* 8 bits characters */

/* stop bit values - on or off */

#define _COM_STOP1	0	/* 1 stop bit */
#define _COM_STOP2	4	/* 2 stop bits */

/*  parity initializers */

#define _COM_NOPARITY	0	/* no parity */
#define _COM_ODDPARITY	8	/* odd parity */
#define _COM_EVENPARITY 24	/* even parity */

/*  baud rate initializers */

#define _COM_110	0	/* 110 baud */
#define _COM_150	32	/* 150 baud */
#define _COM_300	64	/* 300 baud */
#define _COM_600	96	/* 600 baud */
#define _COM_1200	128	/* 1200 baud */
#define _COM_2400	160	/* 2400 baud */
#define _COM_4800	192	/* 4800 baud */
#define _COM_9600	224	/* 9600 baud */


/* manifest constants for BIOS disk support */

/* disk services */

#define _DISK_RESET	0	/* reset disk controller */
#define _DISK_STATUS	1	/* get disk status */
#define _DISK_READ	2	/* read disk sectors */
#define _DISK_WRITE	3	/* write disk sectors */
#define _DISK_VERIFY	4	/* verify disk sectors */
#define _DISK_FORMAT	5	/* format disk track */

/* struct used to send/receive information to/from the BIOS disk services */

#ifndef _DISKINFO_T_DEFINED

struct diskinfo_t {
    unsigned drive;
    unsigned head;
    unsigned track;
    unsigned sector;
    unsigned nsectors;
    void _far *buffer;
    };

#define _DISKINFO_T_DEFINED

#endif


/* manifest constants for BIOS keyboard support */

/* keyboard services */

#define _KEYBRD_READ		0	/* read next character from keyboard */
#define _KEYBRD_READY		1	/* check for keystroke */
#define _KEYBRD_SHIFTSTATUS	2	/* get current shift key status */

/* services for enhanced keyboards */

#define _NKEYBRD_READ		0x10	/* read next character from keyboard */
#define _NKEYBRD_READY		0x11	/* check for keystroke */
#define _NKEYBRD_SHIFTSTATUS	0x12	/* get current shift key status */


/* manifest constants for BIOS printer support */

/* printer services */

#define _PRINTER_WRITE	0	/* write character to printer */
#define _PRINTER_INIT	1	/* intialize printer */
#define _PRINTER_STATUS 2	/* get printer status */


/* manifest constants for BIOS time of day support */

/* time of day services */

#define _TIME_GETCLOCK	0	/* get current clock count */
#define _TIME_SETCLOCK	1	/* set current clock count */


#ifndef _REGS_DEFINED

/* word registers */

struct WORDREGS {
    unsigned int ax;
    unsigned int bx;
    unsigned int cx;
    unsigned int dx;
    unsigned int si;
    unsigned int di;
    unsigned int cflag;
    };

/* byte registers */

struct BYTEREGS {
    unsigned char al, ah;
    unsigned char bl, bh;
    unsigned char cl, ch;
    unsigned char dl, dh;
    };

/* general purpose registers union -
 *  overlays the corresponding word and byte registers.
 */

union REGS {
    struct WORDREGS x;
    struct BYTEREGS h;
    };

/* segment registers */

struct SREGS {
    unsigned int es;
    unsigned int cs;
    unsigned int ss;
    unsigned int ds;
    };

#define _REGS_DEFINED

#endif /* _REGS_DEFINED */


/* function prototypes */

unsigned _cdecl _bios_disk(unsigned, struct diskinfo_t *);
unsigned _cdecl _bios_equiplist(void);
unsigned _cdecl _bios_keybrd(unsigned);
unsigned _cdecl _bios_memsize(void);
unsigned _cdecl _bios_printer(unsigned, unsigned, unsigned);
unsigned _cdecl _bios_serialcom(unsigned, unsigned, unsigned);
unsigned _cdecl _bios_timeofday(unsigned, long *);
int _cdecl int86(int, union REGS *, union REGS *);
int _cdecl int86x(int, union REGS *, union REGS *, struct SREGS *);

#endif /* _MT */
